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Answer Posted / joy
a dialer in an FDAS will also automatically dial or call the
fire station number when fire alarm occurs or when the
building is on fire.
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what about electrical pannel.? What is meant by plc pannel.?
If i have two 3000 kW motors and the whole facility requires a 10 MVA transformer. What would be better installing two 5 MVA transformers(one for 1 motor ) or just a single 10 MVA transformer for both of them. Give reasons for your answer.
While HT line put on to activate ACB in low tention panel VCB tripping instantly.why it happens
L.A. (Lightening Arrester) is located at a place from where transmission line enters the transmitting substation. So L.A. (Lightening Arrester) is the first equipments which has to encounter with lightening, high voltage surges and switching surges. It has to absorb energy of lightening, high voltage surges, and switching surges. L.A. (Lightening Arrester) is made up of layers of semiconductors. If these layers can not tolerate energy released by lightening, high voltage surges, and switching surges the L.A. (Lightening Arrester) blasts.
what is meant by star/delta voltages as 440/220 in a 3 phase induction motor, and why it should be connected on STAR IN 3 PHASE SUPPLY
what is the difference betweem star connected motor & delta connected motor?
We need to current density & short circuit calculation at 65kA for aluminium & copper busbar.
Why do not we prefer non conventional sources of energy to conventional sources?
Why human body feel electric shock?
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Why efficiency of generator is higher than motor at a particular load?
What are reasond for high wattage in single phase induction motors
Explain the operation of grid connected central solar inverter ?
Can double compression glands be used with regular cables?
A 15 kw squirrel cage motor having a maximum efficiency of 90% on a continuous full load has temperature rise of 42 degrees celcius after 30 min and 52 degrees celcius after 1 hr under the above operation conditions. a) calculate its final steady state temperature rise on continuous load and the heating time constatnt. b) if the motor is operated on a short load for 9 min estimate its temperature rise. c) calculate the maximum overload that can be applied on a short, 9 min rating so that the temperature rise is the same as the final steady state temperature rise on continuous load.
